Even though you say that this game is not related to NTR, this scene is unacceptable to me. I really don't like to share. Can you at least delete or fix it? Or switch to a masturbation scene like maria. Please have mercy on us.😥
I respect your opinion on multiple partners, but that scene shouldn't be specifically labeled as NTR. It currently plays out as a spontaneous consensual threesome. There is no dialogue of betrayal, a comparison between lovers, or anything unwanted by the unknown girl or her friend that would relate it to NTR.
We can suggest that the developer add "(threesome)" or "(join)" to the end of the choice that causes that scene. Then it can be clear and avoidable.